is there a way to delete terminals after they have been pressed once? I have a computer panel that when activated by  a script, spawns some enemies. If the player keeps pressing it, it will keep spawning enemies each time. I'd like for this to only occur once. 

Use variables.

Variables are the way to go. Just set one to 1 after terminal is done with its work and put a condition that tells to skip the code if variable is set to 1.